Single-electron solitons (or movable polarons) can originate near a metal surface owing to interaction with image charges. Image charges (really, surface charges) appear in response to the ‘instant’ electron density (probability density). Interaction with metal electrodes (as well as any polarization of the environment) much affects a charge qubits functioning. To verify this theory we propose a crucial experiment based on the motion of electrons in a magnetic field in presence of weak and strong polarization.